package com.eunion.boot.spring;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import org.springframework.web.context.request.ServletWebRequest;

import com.eunion.core.LogUtil;

/**
 * Spring Util，获取Spring 上下文.
 * 
 * @since 2016年12月23日
 */
@Component
public class SpringUtil implements ApplicationContextAware {

	private static ApplicationContext applicationContext = null;

	private static ProjectSettings properties = null;

	@Override
	public void setApplicationContext(ApplicationContext applicationContext)
	    throws BeansException {
		if (SpringUtil.applicationContext == null) {
			SpringUtil.applicationContext = applicationContext;
		}

		LogUtil.get(this.getClass()).info("======== SpringUtil OK ,  ApplicationContext is : {}  ========", applicationContext);
	}

	//获取applicationContext
	public static ApplicationContext getApplicationContext() {
		return applicationContext;
	}

	//通过name获取 Bean.
	public static Object getBean(String name) {
		return getApplicationContext().getBean(name);
	}

	//通过class获取Bean.
	public static <T> T getBean(Class<T> clazz) {
		return getApplicationContext().getBean(clazz);
	}

	//通过name,以及Clazz返回指定的Bean
	public static <T> T getBean(String name, Class<T> clazz) {
		return getApplicationContext().getBean(name, clazz);
	}

	/**
	 * 获取配置文件中的配置.
	 */
	public static ProjectSettings getProperties() {
		return properties;
	}

	protected static void setProperties(ProjectSettings properties) {
		SpringUtil.properties = properties;
	}

	/**
	 * 能获取当前的request.
	 */
	public static HttpServletRequest getRequest() {
		HttpServletRequest req = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();
		return req;
	}

	/**
	 * 能获取当前的response.
	 */
	public static HttpServletResponse getResponse() {
		HttpServletResponse resp = ((ServletWebRequest) RequestContextHolder.getRequestAttributes()).getResponse();
		return resp;
	}

}
